Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Statement of Redeemable Preferred Stock and Stockholders??? Equity

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Condensed Consolidated Statement of Redeemable Preferred Stock and Stockholders’ Equity - USD ($)
$ in Thousands
Total
Pre-Paid Advance Agreement
Standby Equity Purchase Agreement
Securities Purchase Agreement
Redeemable Preferred Stock
Common stock
Common stock
Pre-Paid Advance Agreement
Common stock
Standby Equity Purchase Agreement
Additional paid-in capital
 [1]
Additional paid-in capital
Pre-Paid Advance Agreement
 [1]
Additional paid-in capital
Standby Equity Purchase Agreement
 [1]
Additional paid-in capital
Securities Purchase Agreement
Accumulated deficit
Balance as of beginning of period (in shares) at Dec. 31, 2022         0                
Balance as of beginning of period (in shares) at Dec. 31, 2022 [1]           15,452,000              
Balance as of beginning of period at Dec. 31, 2022 $ 236,573       $ 0 $ 2 [1]     $ 1,416,394       $ (1,179,823)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                          
Repurchase of unvested shares – forfeitures (shares) [1]           (1,000)              
Issuance of shares for restricted stock units vested (in shares) [1]           120,000              
Issuance of shares under employee stock purchase plan (in shares) [1]           30,000              
Issuance of shares under employee stock purchase plan 389               389        
Vesting of early exercised stock options and restricted stock awards 26               26        
Issuance of shares under the PPA and SPA, net of offering costs (in shares) [1]             2,903,000 2,174,000          
Issuance of shares under the PPA, SPA , ATM, SEPA and PIPE   $ 64,389 $ 10,161 $ 1,600     $ 0 [1] $ 0 [1]   $ 64,389 $ 10,161 $ 1,600 [1]  
Reclassification of warrant liability to additional paid-in capital 19,510               19,510        
Stock-based compensation 9,836               9,836        
Net loss (90,732)                       (90,732)
Comprehensive loss (90,732)                       (90,732)
Balance as of end of period (in shares) at Mar. 31, 2023         0                
Balance at the end of the period (in shares) at Mar. 31, 2023 [1]           20,678,000              
Balance as of end of period at Mar. 31, 2023 $ 251,752       $ 0 $ 2 [1]     1,522,305       (1,270,555)
Balance as of beginning of period (in shares) at Dec. 31, 2023 45,000       45,000                
Balance as of beginning of period (in shares) at Dec. 31, 2023 37,591,000         37,591,000 [1]              
Balance as of beginning of period at Dec. 31, 2023 $ 249,576       $ 5,607 $ 4 [1]     1,725,809       (1,481,844)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                          
Issuance of shares for restricted stock units vested (in shares) [1]           1,892,000              
Issuance of shares for restricted stock units vested 0                        
Issuance of shares under employee stock purchase plan (in shares) [1]           26,000              
Issuance of shares under employee stock purchase plan 79               79        
Issuance of shares under the PPA and SPA, net of offering costs (in shares) [1]             21,935,000 290,000          
Issuance of shares under the PPA, SPA , ATM, SEPA and PIPE   54,940 $ 562       $ 2 [1]     54,938 $ 562 $ 1,600  
Issuance of shares under YA convertible debenture (in shares) [1]             4,672,000            
Issuance of shares under YA convertible debenture   $ 22,254               $ 22,254      
Exchange of YA warrants (43,416)               (43,416)        
Accretion of preferred shares 0       $ 862       (862)        
Stock-based compensation 10,954               10,954        
Net loss (110,687)                       (110,687)
Comprehensive loss $ (110,687)                       (110,687)
Balance as of end of period (in shares) at Mar. 31, 2024 45,000       45,000                
Balance at the end of the period (in shares) at Mar. 31, 2024 66,406,000         66,406,000 [1]              
Balance as of end of period at Mar. 31, 2024 $ 184,262       $ 6,469 $ 6 [1]     $ 1,770,318       $ (1,592,531)
[1] Periods presented have been adjusted to reflect the 1-for-23 reverse stock split on March 8, 2024. See Note 1- Organization and Basis of Presentation - Reverse Stock Split, for additional information.